Question :Normal distribution theory tells us that for large samples, 95% of sample means lie within how many standard deviations above and below the population mean?1. 952. 1.963. Whatever the z-score is.4. The square root of the sample size.

We do not know whether the pattern of results found in our samples accurately reflects what is happening in the population or if it is the result of _____ error.1. Distribution2. Mean3. Sampling4. Confidence

Suppose that some assessment results for two types of offenders (sex offenders and violent offenders) were 60 and 50 respectively. Which type of offender did better in comparison to other offenders on the treatment course and which may need further treatment? The group means and SDs are 50 and 9 for sex offenders and 45 and 3 for violent offenders.1. To make such comparisons you need to convert the assessment results into z-scores. Thus the violent offender scored better in comparison to other offenders on his treatment course and you may perhaps want to refer the sex offender for more treatment.2. 95.15% of violent offenders scored better in comparison to this offender on his treatment course. You may perhaps want to refer the sex offender for more treatment.3. It is not possible tell from this data.4. The sex offender scored better in comparison to other offenders on his treatment course and you may perhaps want to refer the violent offender for more treatment.

You have the IQs of a set of people. The mean of these IQs is 100. The standard deviation is 15. One student scored 90 on the test. This produced a z-score of -0.67 or -0.7 to 1 decimal place. Using the z-score table in appendix 1, what does this mean?1. Taking the z-score to 1 decimal place the table tells us that 75.80% of people in the set would have IQ's equal to, or greater than, the student. In other words the student is not very intelligent.2. Taking the z-score to 1 decimal place the table tells us that 75.80% of people in the set would have IQ's equal to, or lower than, the student. In other words the student is very intelligent.3. Taking the z-score to 1 decimal place the table tells us that 24.20% of people in the set would have IQ's equal to, or greater than, the student. In other words the student is very intelligent.4. None of the above.

The mean of a set of IQs is 100 and the standard deviation is 15. The z score for one student is +2.2 Using the necessary z-score table in appendix 1, what does this mean?1. It tells us that the score is 2.20 standard deviations below the mean.2. 98.61% of scores are equal to or greater than this student's score - they are not very bright.3. Only 1.39% of scores are equal to or greater than this student's score - they are very bright.4. 1.39% of scores are equal to or lower than this student's score - they are not very bright.

Convert the age of a 32 year old to a z-score if the mean of the set of ages is 40 years and the standard deviation of age is 6 years.1. -4.252. -1.333. 1.334. It is not possible to convert these figures into z-scores.

In order to use standard normal distribution you need to transform the scores in the sample to the standard normal scores. This is achieved by which of the following? What is the result called?1. Subtracting the score from each mean and then dividing by the standard deviation. The result is called a z-score.2. Subtracting the mean from each score and then dividing by the standard deviation the result is called a z-score.3. Subtracting the score from the standard deviation and then dividing by mean of each score. The result is called a probability distribution.4. Subtracting the mean from the standard deviation and then dividing by each score. The result is called a probability distribution.

Which of the following is not a conditional probability?1. The probability of passing your exam without any revision.2. The probability of suffering a sports injury while playing rugby.3. The probability of falling down stairs.4. The probability of contracting a disease whilst working in a hospital unit for contagious diseases.

Inferential statistics deal with:1. Making conclusions and generalizations about population/s from our sample data.2. The tabulation and organization of data in order to demonstrate their main characteristics.3. Giving the best estimate of the population mean.4. Both the second and third statement.